TY  - JOUR
PY  - 2022//
TI  - Temporal variation of b value with statistical test in Wenchuan area, China prior to the 2008 Wenchuan Erthquake
JO  - Entropy (Basel, Switzerland)
A1  - Xie, Weiyun
A1  - Hattori, Katsumi
A1  - Han, Peng
A1  - Shi, Haixia
SP  - e0494
EP  - e0494
VL  - 24
IS  - 4
N2  - The Gutenberg-Richter b value describes the ratio between large and small events. A number of studies have suggested that the b value decreases before large earthquakes. In this study, we investigate the temporal variation of the b value of an area along the main rupture zone of the 2008 Wenchuan earthquake (M8.0) prior to the great event. Before estimating b values, we tested the earthquake catalog to make sure that we use the reliable frequency-magnitude distribution by the calculation of MC (completeness of magnitude). We define parameter P (ΔAIC ≧ 2) values to examine the significance level of b-value changes in the temporal variation by combining a boostrap method with Akaike's Information Criterion (AIC). The b value in the main rupture zone shows a long-term decrease trend. We then focus on a smaller area where the initial rupture starts. The results show that b values significantly changed about 3 months before the 2008 Wenchuan earthquake in the initial rupture area, indicating that the b value has a potential capability to monitor and detect precursory phenomena of great earthquakes.<p />  <p>Language: en</p>
LA  - en
SN  - 1099-4300
UR  - http://dx.doi.org/10.3390/e24040494
ID  - ref1
ER  -